Removes local branches that no longer exist on origin

git-clean-local-branches.sh

#!/bin/bash

echo "Fetching latest information from origin..."
git fetch origin --prune

echo ""
echo "Identifying local branches that no longer exist on origin..."

# Get a list of local branches
LOCAL_BRANCHES=$(git branch --list | sed 's/\* //g' | sed 's/ //g')

# Get a list of remote branches from origin
REMOTE_BRANCHES=$(git branch -r | grep origin/ | sed 's/origin\///g' | sed 's/ //g')

BRANCHES_TO_DELETE=()

for local_branch in $LOCAL_BRANCHES; do
    # Skip master/main and other protected branches if you have them
    if [[ "$local_branch" == "master" || "$local_branch" == "main" ]]; then
        continue
    fi

    # Check if the local branch exists on origin
    echo "$REMOTE_BRANCHES" | grep -q "^$local_branch$"
    if [ $? -ne 0 ]; then
        # Branch does not exist on origin
        BRANCHES_TO_DELETE+=("$local_branch")
    fi
done

if [ ${#BRANCHES_TO_DELETE[@]} -eq 0 ]; then
    echo "No local branches found that are not on origin. Your local repository is clean!"
else
    echo ""
    echo "The following local branches appear to no longer exist on origin:"
    for branch in "${BRANCHES_TO_DELETE[@]}"; do
        echo "- $branch"
    done

    echo ""
    read -p "Do you want to delete these branches? (y/N): " -n 1 -r
    echo ""

    if [[ $REPLY =~ ^[Yy]$ ]]; then
        for branch in "${BRANCHES_TO_DELETE[@]}"; do
            echo "Deleting branch: $branch..."
            git branch -D "$branch"
        done
        echo "Done! Local branches have been cleaned up."
    else
        echo "No branches were deleted."
    fi
fi

echo ""
echo "Script finished."